problem4-11 - PROBLEM 4.11 KNOWN: Operating conditions of a...

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PROBLEM 4.11 K NOWN: Operating conditions of a buried superconducting cable. F IND: Required cooling load. S CHEMATIC: ASSUMPTIONS: (1) Steady-state conditions, (2) Constant properties, (3) Two-dimensional conduction in soil, (4) One-dimensional conduction in insulation, (5) Pipe inner surface is at iquid nitrogen temperature. l A NALYSIS: The heat rate per unit length is () ()() gn gI 1 goo i TT q RR q k 2 /ln 4z/D ln D /D /2 k ′ = ′′ + ′ = ⎡⎤ + ⎣⎦ ππ
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This note was uploaded on 12/07/2010 for the course MAE Heat Trans taught by Professor Lee,j.s. during the Spring '10 term at Seoul National.

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